OS X…
…is definitely the greatest thing! Apple is good at interface design, I’m pretty sure. Everything’s simplified in OS X — not that I couldn’t handle the intense complexity of XP, just that the intense complexity of XP was the root of all of its problems. I imagine Microsoft gets often lost in their own code.
OS X is Unix-based, which is excellent. It runs much faster than my Windows machines with similar specs have (although, to be honest, this is my first dual-core computer…), and I really like the interface much more. The way files, programs, and windows are laid out makes so much sense and keeps everything easy, giving me more time to do stuff.
Dashboard’s nice, I can keep track of D-Syn’s statistics and Twitter, weather, movies, etc. Quicksilver has definitely increased productivity, and if you’re on a Mac and not using, go get it! Right now! It’s deliciously free and unimaginably useful! I could not live without it.
Of course, there are problems with OS X. Not all hardware works with it, I’ve had DJ equipment stop working (but then start working again…?), and some graphic tablets don’t work for Mac, which has limited my options in shopping for one. The way the file system is laid out doesn’t give you a lot of room for customization (i.e. having things where you want), but it’s adaptable enough for me, and anyone who is stubborn in that way has no business working on one of these lovely machines.
The main problem I’ve been having is getting wifi. Whereas my Windows laptop could get perfect reception from this range (which is actually fairly far from the router), the MacBook cannot. I believe this is because I have a Wireless-G router, and the MacBook has a Wireless-N card. I should be upgrading shortly.
All in all, a great, dependable purchase, and a definite upgrade. Bottom line: sexy.

What kind of tablet do you use?
I use a teeny little Wacom Bamboo, and I’ve explored other options but can’t find a decent large tablet for cheap that works with OS X.
Jeff uses a much larger Aiptek Hyperpen. If that tablet works with OS X (haven’t tested it yet), I’ll probably get one of those.